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研究生:黃勝弘
研究生(外文):Sheng-Hung Huang
論文名稱:「隔間容器阻尼器」動力特性之試驗研究
論文名稱(外文):Experimental Study on the Dynamical Behavior of Partitioned Tank Damper
指導教授:丁舜臣唐啟釗
指導教授(外文):Shuenn-Chern TingChii-Jau Tang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:水利及海洋工程學系專班
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:75
中文關鍵詞:隔間容器阻尼器
外文關鍵詞:Partitioned Tank Damper
相關次數:
  • 被引用被引用:3
  • 點閱點閱:183
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  • 下載下載:20
  • 收藏至我的研究室書目清單書目收藏:0
  隔間容器阻尼器(Partitioned Tank Damper, PTD)係一矩形儲水容器,中間設有隔板,兩側流體可通過此隔板底部之開口形成交互流動。液面處有浮蓋板,可減少液面處產生飛濺和造波現象。PTD 配置於結構系統中可藉此流動作用達到減振效果。本文旨在研究PTD 本身的動力特性。
  當選定特定之PTD 進行模型試驗時,其中自由振動試驗選定的控制參數包括隔板底部開口高度有9 種、容器內水深有3 種,共有23 組案例;強制振動試驗尚考慮振動台振動頻率3 種,振動頻率分別是大於、接近和小於PTD 本身的頻率,共有69 組案例。進行此兩種振動實驗時,以數位攝影機紀錄觀測振動時PTD 內部水體運動狀況。數值計算以水深12.5 ㎝的流況為例,採用瞬時貼壁格網,以有限解析法搭配有限差分法,求解內部流場的流函數和渦度函數,並使用SOR 法加快疊代收斂速度。最後,算出容器邊壁之壓力分布。
  自由振動實驗結果顯示,其水位振盪高度衰減速率與開口高度有關。水深和開口高度比值小於1/2 時,此衰減率近似於線性分布,反之,則近似於負指數分布。強制振動實驗結果顯示,振動頻率接近PTD 本身的頻率時,水位變化最大。由數值模擬可獲得的流況,發現在隔板兩側會有較強烈的渦流交替產生,影響壓力瞬時分布。
  由以上的的試驗可以發現PTD 的確能達到檢振的效果,日後繼續研究者,可將PTD 搭配氣壓幫浦,以主動方式控制,加速結構物的振盪之衰減速度和減少振盪之振幅。
  Partitioned Tank Damper (PTD) is a rectangular reservoir equipped with a partition board in the middle, under which the fluid flow oscillates between two side tanks through its bottom opening. PTD can be mounted in a structure system to reduce the vibration of such a structure system. This thesis attempts to investigate the dynamical behaviors of a PTD.
  For PTD model test in the laboratory, there are several control parameters chosen to set up the free vibration experiment, including nine different partition openings and three different water depths, for totally twenty-three cases. In addition, the Forced vibration experiment must be examined by three vibrating frequencies being layer, equal to, and less than the natural frequency of PTD. This will present sixty-nine cases in total. The author also observe the water motion in PTD by using digital a video camera for running these two types of vibration experiment. Two floating covers on the water surface are utilized to prevent from water sloshing or wave breaking .To shed a light on the flow pattern during the case of 12.5 centimeter in water depth for numerical simulation.
  The experimental result for test shows that the decreasing rate of water vibration, the author demonstrates related to the opening height. When the ratio between water depth and opening height is lower than in a PTD is closely1/2, the decreasing rate is approximated the to be linear. Otherwise, this rate is exponentially decade. For the forced vibration experiment the result shows that the water depth changes largest when the vibration frequency gets close to PTD’s natural frequency. Numerical result shows that those strong vortices occur alternately near the partition board when flow oscillates between two partitions.
中文摘要 I
Abstract II
謝誌 III
目錄 IV
表目錄 VI
圖目錄 VII
照片目錄 IX
符號說明 X
1-1 前言 1
1-2 文獻回顧 2
1-3 研究方法 2
1-4 本文組織 3
第二章 相關理論 4
2-1 結構系統控制方程式 4
2-2 流場控制方程式 5
2-2-1 座標系統 5
2-2-2 運動方程式 7
2-3 初始及邊界條件 9
2-3-1初始條件 9
2-3-2流函數邊界條件 9
2-3-3渦度函數邊界條件 11
2-4 流體對結構物的作用力 14
第三章 試驗研究 16
3-1 試驗設備 16
3-2 儀器之率定 18
3-3 試驗佈置 19
3-4 試驗條件 19
3-5 實驗步驟 20
3-5-1 自由振動試驗 20
3-5-2 強制振動試驗 21
第四章 試驗結果與討論 22
4-1 自由振動之分析與討論 22
4-1-1 浮板頻率分析及討論 22
4-1-2 振幅衰減速率 23
4-1-3 浮板角振動模擬 23
4-2 強制振動之分析與討論 24
第五章 數值計算 26
5-1 建立格網 26
5-2微分方程式離散處理方式 27
5-2-1 流函數-Poisson方程式之有限差分離散方式 27
5-2-2 有限解析法離散方程式 28
5-2-3 有限差分法求解速度場 30
5-3計算流程 31
5-4 模式測試 32
5-4-1 問題描述 32
5-4-2 初值和邊界條件 32
5-4-3 離散方式比較 33
5-4-4 SOR值測試 33
5-4-5 格網分析 34
5-4-6 收斂判斷測試 34
5-5 數值計算結果與討論 35
5-5-1 含浮蓋板之TLD系統 35
5-5-2 含浮蓋板之PTD系統 35
第六章 結論與建議 37
6-1 結論 37
6-2 建議 38
參考文獻 39
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